Picker-stick motion for looms



Aug. s ,1926. y 1,594,878

H. A. pAvlS PICKER STICK MOTION Fon Looms Filed April 16, 1925 2 sheets-*sheet 1 Aug. 3,1926. l 1,594,878

H. A.' DAVIS PICKER STICK MOTION. FOR LOOMS Filed April 16. 1925 '2 Sheets-Sheet 2 y I Fig. 4.

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Hurry A. Davis byww Ays.

Patented Aug. 3, 1926. v` i l UNITED STATES PATENT OFFICE.

HARRY A. nAvIS, or ITOPEDALTL MASSACHUSETTS, AssIcfNoIe. TO'DRAPER CORPORA- TION, or IIOPEDALE, MASSACHUSETTS, A CORPORATION or MAINE.

:PICKER-STICK MOTION ron. LooMs.

Application lediAprl 1,6, 1925. Serial No. 23,699.

This invention relates to a picker stick motion for a loom of that type in which au picker stick includes at its lower end a rocker shoe mounted to rock upon a rocker support carried by the lay rock shaft and in which the coniiguration'of the surfaces of the rocker shoe and rocker support is such as to maintain the path of movement of the effective end of the picker stick where the picker is located substantially rectilinear and preferably in parallelism with the lay.

The main object Vof the invention Vs to provide means for maintaining the rocker shoe throughout its range `of 'movement inv contact with the rocker support and thusy prevent jumping ofthe picker, whereby the accurate movement of the effective end of the picker stick is secured.

A further object of the invention is to provide a simple and eificient means for angularly adjusting the path of movement of the effective end of the picker stick with respect to the lay.

These and other objects Vand features of .the invention will appear more fully from the accompanying description and drawings and will be particularly pointed out in the claims. As this general type of picker stick motion is well known and farniliar to those Skilled in the art, it is only necessary to illustrate` and describe those parts of the loom directly concerned with the present invention. Furthermore, as the Fig. 4 is a view similar to Fig. 1 large-A ly in vertical cross section and with the picker stick motionl shown lat the opposite end of its movement.

'In a picker stick motion' of this type, the lay rock shaft 1, which has its bearing in the loom side 2, has mounted thereon outside .0f the loom frame a suitable rocker support upon which the rocker shoe of the picker stick is supported and rocks ing a fiat top Surface, is pivotally mounted j motion.

during the movement ofthe picker motion. In the preferred formV of the present invention, this rocker support comprises a base v3, having a hub 4, fitting over and secured to the end of the lay 'rock shaft 1. It is desirable, inl this type of picker motion known as the parallel type, that there be provided some means whereby the path of the effective or upper end of the picker stick may be adjusted into or slight-ly out of parallel with the surface of the lay so as to give a workable motionv in the picking lof the shuttle. In the present inven tion, this is secured by providing as a part ofthe rocker support a bed plate which is angularly and vertically adjustable on the base or angularly adjustable toward and from the lay so as to produce the desiredv result. For this purpose a bed plate 5, havat-G to the outer end of the base 3 and is rigidly and vertically adjustably secured to the base at its inner end. The bed plate is shown as provided with depending side flanges? fitting over corresponding depending side flanges 8 of the base. At its inner end, the bed plate is centrally provided with va depending lug 9` which passes downvv through' a slot 10 n the bed plate 3. A transverse shouldered shaft 11 is journalled in the side flanges 8 of the base and has a central eccentric section 12 passing through an `elongated slot 13 in the lug 9, and this A set screw 15 in one ofthe flanges 8 of the `base abuts against the shaft 11. It will thus be seen that by lplacing a key or wrench shaft is provided` with a polygonal end 14.

on the polygonal end 14 of the shaft- 11 and turning this shaft, that the bed plate 5 may be vertically and angularly adjusted on the base as required, and then locked in adjusted position by means of the set screw 15.

In the preferred construction illustrated, the entire picker stick motion is carried by the bed plate portion 5 of the rockerV Y ysupport so that the adjustment of this bed plate effects the desiredrel-ation of the path 'l of the effective end of the picker stick with f respect to the lay without disturbing in any way the relation of the parts of the picker The rocker shoe is provided with a shank 16, having a socket in its upper end in which is litted the lower end of the usual picker stick 17. The picker stick is rigidly secured in this socket by a bolt 18. The base 19 of the rocker slice is shaped on its lower surface so that as it rocks on the surface of the bed'plate the effective end ofthe picker stick, where the picker isY located, will have the required substantially rectilinear movement. The rocker shoe is provided with an extension 2O depending from and passing.y

down through the rocker support'. This eX- tension, as isu'sual, rests against a transverse abutment, shown as a roller 21 mounted on a stud 22, which studin the present invention,

the other end to some fixedwportion of the rocker support, such as the lug 27 on' the hub 4. The purpose of these features of the construction is, as usual, to maintain the longitudinal position of the/rocker shoe during the picking motion and to` return the picker stick at the conclusion of its picking move.-

ment. Y A v Considerable difficultyhas been experi eneed in picker motions ofthis type because of the jumping of the picker stick and rocker shoe or the failure of the rocker shoe to remain in contact with the rocker support throughout its range of movement; l/Vhen this takes place, the required picking movement is interfered with and damage notin frequent-ly caused to the loom.V

In the present; invention, ycooperating means are provided on the picker member, which comprises the picker stick and rocker shoe, and on the rocker support, which in the preferredV construct-ion vcomprises the base and the adjustable bed plate, which cooper-y ating' means act'positively to preventl lifting of the picker member throughoutits rangey .fof movement from the path prescribed by the rocker support and the rocker shoe. These cooperating means preferably comprise a transverse guide preferably carried by the depending extension 2O of the rocker shoe, and a. downhold cam movably, and preferably pivotally, mounted on the rocker support and moved by therocker shoe so as to maintain this downhold cam throughout the range .of movement ofthe rocker shoe directly superjacent this transverse guide.

In the preferredv construction illustrated, the downward extension of the rocker shoe is slotted vert-icallyor bifureated and provided at its lower end with a transverse stud 2S on which is mounted a roller 29 between the bifurcations, and-this roller constitutes the transverse guide.

In the preferred construction illustrated also, the downhold cam is mounted onthe bedY plate 5; For this purposejthe bed'plate is provided with an' upwardly Vprojecting.; arm 30 Vcurved youtwardly at its upper end. This end is slotted or bifurcated and provided with a transverse stud 31. The downhold cam 32 is of sickle shape, so as not to engage the roller 21. This downhold cam is pivotally mountedon the stud 31 and its upper extension 33 is slottedV at 34 to engage 1 and slide upon a block 35whichpivots upon the pin l36, transversely mounted, inthe shank 16 of the rocker shoe. It will vthus be seen that as thel rockershoe ismoved: between the positions shown in Figsfl: and 4, they downhold cam., will be swung upon itspivot 31, due to its sliding engagementv with; the

rocker shoe between the positions illustrated.l

in Figs. 1 and 4. The Youterlower surface 37 of the downhold caniis so designedlthat during this movementit will alwaysbe maintained vimnfiediately superjacent or in contact with the roller- 29 of the transverseguide. `Consequently, it is impossible forvtheV rocker shoe to lift off Aorjuiiip?r fronithe surface of the rocker support or thebed plate duringthe entire range of movement of the picker stick.

N'ot only isthe ent-ire construction, inthe preferred form of the invention,carriedl upon the bed plate 5 so as to kbe angularly adjustable therewith, but the construction is also preferably suchk as tobe symmetrical with respect to the central, vertical plane of movement ofthe picker stick. Thus it will.

be seen that the rocker support, including the bedkplate 5 and the base, is provided with a central, vertical slot in which the depending extension 20 from the rockershoe and the downholdcani 32 operate, that the de- Y ,pending vextension 2O is itself slotted` or bi- Hav-ing thus described the invention, wha

is claimed as new, and desired to beV secured.

by Letters Patent, is:

1. In a picker motion for a loom, a rocker support mounted on the,4 lay rockshaft and presentinga flat top surface, a. picker member comprising a picker stick and a-rocker shoe mounted to rockon the fiat 'topfsurface `,of the rocker fsupport, and cooperating f,

means on the picker member and the rocker support acting positively to prevent lifting of the picker member throughout its range of movement from the path prescribed by the rocker support and the rocker shoe.

2. In a picker motion for a loom, a rocker support comprising a base mounted on the lay rock shaft and a bed plate angularly adjustable on the base toward and from the lay, a picker member comprising a picker stick and a rocker shoe mounted to rock on the bed plate of the'rocker support, and cooperating means on the picker member vand the bed plate acting positively to prevent lifting of the picker member throughout its range of movement from the path prescribed by the rocker support and the bed plate, whereby the entire mechanism is bodily and angularly adjustable with respect to the base of the rocker support, and consequently to the lay, thereby to adjust the pat-h of movement of the effective end of the picker member.

3. In a piclrer motion for a loom, a rocker support presenting` a base mounted on the lay rock shaft and a bed plate pivoted transversely to the base at one end and means for vertically adjusting the other end of the bed plate on the base, a picker member comprising a picker stick and a rocker shoe mounted to rock on the bed plate of the rocker support, and cooperating means on the picker member and the bed plate acting positively to prevent lifting of the picker member throughout its range of movement from the path prescribed by the rocker support and the bed plate and whereby the entire mechanism .supported by the bed plate is bodily and angularly adjustable to adjust the path of movement of the effective end of the picker member.

4. In a picker motion for a loom, a rocker support comprising a base mounted on the lay rock shaft an-d a bed plate angularly adjustable on the base toward and from the lay, and a picker member comprising a picker stick and a roclrer shoe supported by and mounted to rock throughout its range of rocking movement on the bed plate, whereby the entire picker member is bodily and angularly adjustable with the bed plate to adjust the path of movement of the effective end of the picker member.

5.k In a picker motion for a loom, a rocker .support comprising a base mounted on the lay rock shaft and a bedplate pivoted transversely tothe base at one end and means for vertically adjusting the other end of the bed plate on the base and a picker member comprising a picker stick and a rocker shoe supported by and mounted to rock throughout its range of rocking movement on the bed plate, whereby the entire picker member is bodily and angularly adjustable to adjust the path of movement of the effective end of the picker member.

6. A picker motion for a loom having the construction defined in claim 5, in which the means for vertically adjusting the bed plate on the base of the rocker support comprises an eccentric engaging the bed plate and rotarily adjustable in the base.

7. In a picker motion for a loom, a rocker support mounted on the lay rock shaft, a rocker shoe mounted to rock on the rocker support, a depending extension from the rocker shoe having a transverse guide, and a movable downhold cam carried by the rocker support and moved by the rocker shoe to maintain throughout the range of movement of the rocker shoe a position directly superjacent the said guide, thus to prevent the rocker shoe from lifting off the rocker v support.

8. A picker motion for a loom having the constructiondefined in claim 7 in which the downhold camis pivotally mounted on the rocker support and has a sliding and rocking engagement with the rocker shoe to effect its stated function.

9. In a picker motion for a loom, a rocker support comprising a base mounted on the lay rock shaft and a bed plate vertically and angularly adjustable on the base, a rocker shoe supported by and mounted to rock on the bed plate, a depending extension from the rocker shoe having a transverse` guide, and a movable downhold cam carried by the bed plate and moved by the rocker shoe to maintain throughout the movement of the rocker shoe a` position 'directly superjacent to said guide to prevent the rocker shoe from lifting off the bed plate.

10. In a picker motion for a loom, a rocker support mounted on the lay rock shaft and having a central, vertical, longitudinal slot, a rocker shoe mounted to rock on the rocker support and having a central, vertical, longitudinal slot, an arm projecting from the rocker support up through the slot of the rocker shoe, an extension depending from the rocker shoe down through the slot of the rockerV support, a transverse guide on the lower end of the extension, and a downhold cam pivoted on the upper end of the arm, slidingly connected to the rocker shoe, projecting down through the slots of the rockerl shoe and rocker support and maintained during the movement of the rocer shoe directly superjacent the said Gui e.

D 1l. A picker motion for a loom comprising the construction defined in claim l0, in which the upper end of the arm and thedepending extension are both centrally .slotted HARRY A. Davis.` 

